单项选择题

The rules are to (rigid) to allow for human error.（）

A．general
B．complex
C．direct
D．inflexible

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单项选择题

The police will need to keep a (wary) eye on this area of town.（）

A．naked
B．cautious
C．blind
D．private

单项选择题

Come out, or I'll (bust) the door down.（）

A．shut
B．set
C．break
D．beat

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